Is there any difference in the truck? I mean.. are the numbers they quote the difference between towing with a bumper ball vs the class III?

If you install a hitch, you should be good as anything else. Unless its an automatic. Then, well.. be careful if its heavy.

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the bumper is only rated for 3500 LBS where with factory tow package it’s rated at 6500lbs. the bumper is not as strong as a class 3 hitch.(the metal of the bumper it self is not as strong or thick as whats used for a hitch.)

also WITH the factory tow package it add’s bugger battery, bigger alternator, larger oil cooler and a trans cooler. also pre wired for a brake controller so all you have to do is buy one and plug it in. there is a plug under the driver side lower dash some where i don’t know exact location.

The only thing I'd really be worried about if you don't have the tow package but you do have the class III hitch setup is that you won't have a transmission and oil cooler to help for longer pulls and trailer brakes. If you're going to pull something heavy short distances then it wouldn't really be a huge issue as long as you don't pull up long hills at high speeds or stress it too much.